Hot gas agitator for heaters



HOT GAS AGITATOR FOR HEATERS Filed June 25, 1947 2 SPEETS-SHEET l m ll 'INVENTOR. PAL PH A. Kmuss ATTORNEY Dec. 18, 1951 R. A. KRAUSS 2,579,325

HOT GAS AGITATOR FOR HEATERS Filed June 25, 1947 2 SHEETS-SHEET 2INVENTOR. 7mm 4. mm U55 ATTORNEY Patented Dec. 18, 1 951 UNITED STATESPATENT OFFICE HOT GAS AGITATOR FOR HEATERS Ralph Anthony Krauss,Philadelphia, Pa., as-

signor to Anthracite Equipment Corporation, Wilkes-Barre, Pa., acorporation of Delaware Application June 2 5, 1947, Serial No. 756,987,4 Claims. (01.110-97) The present invention relates to heaters andmore'particularly to a device for increasing the efficiency of boilersand heaters.

' 'An object of the invention is to provide means for securing greaterheat absorption per unit of heating surface. An important feature of theinvention in that connection is the provision of a device which impelsthe hot gases from the furnace fire bed along the heat absorbing-wallsof the furnace; thereby obtaining marked increase in the absorption ofheat by said walls, and greatly increasing the furnace efiiciencywithout the addition of large areas of heating surface.

The invention, more specifically, provides a fan or agitator which isarranged to draw hot gases from the fire bed and to force them alongheat-absorbing furnace walls. The fan or agitator may be so arranged asto impel the gases repeatedly and at high velocity against the samesurface areas of a heater as are exposed in the conventional heater togases which impinge thereon only once and'at relatively low velocity. Itmay effect repeated circulation of the hot gases in the combustionchamber at high velocity, thereby contributing still further toincreaseof heat output without change of dimensions of either heater or chimney.

Other features and advantages of the invention will be hereinafterdescribed and claimed.

In the accompanying drawings Fig. 1 represents a sectional elevation ofa heating apparatus embodying the present invention; Fig. 2 represents aperspectiveof the'form of agitator shown in Fig. 1; Fig. 3 represents asectional elevation of a heater equipped with another form of agitator;Fig; 4 represents a perspective of the agitator shownin Fig. 3; and Fig.5 represents a detail in bottom, plan of the agitator shown 3.

Referring to the drawings one. form of the present invention is shown inFig. 1 as including a chamber I 0 of a boiler or heater I I of any wellknown type for heating Water or air as the case may be. Asshown, theheater II is of thecoal fired type having a coaling door l2 opening tothe chamber in above a grate l3, and also having a gas outlet I4 leadingto the flue or chimney. The heater walls, as shown, maybe hollow toprovide a jacket adapted to contain water or other suitable fiuidmediumto be heated.

It will be' noted that in this embodiment the lower wall portion of thechamber [0 surrounds a fire bed on the grate I3; while the upper wallportion extends beyond said fire bed. The inner surfaces of said upperwall portion thus absorb heat from the combustion gases emerging fromsaid bed and transfer said heat to the water or other fluid medium inthe surrounding jacket.

For creating turbulence of the gases within the combustion chamber [0 inorder to project the combustion gase violently against the heatjectingend of the shaft sleeve I1 is anchored by,

attachment to the horizontal arm 22 of a wall bracket 23, while theshaft l6 passes through an opening 24 provided in the arm 22.

For driving the shaft I6 at a selected speed the motion transmittingmeans, shown by way of example, includes a pulley 25 fast on the shaftl6 and driven by a belt 26 from a second pulley 21 keyed or otherwisemade fast to the shaft 28 of an electric motor 30. This latter iscarried by the bracket 23. The speed for best results can be obtained byvariation of pulley diameters as well understood.

Preferably the impeller I5 is located well within the dome I8 and abovethe ga outlet [4 but the invention is not limited to this preciseassembly since advantageous results may be obtained-by positioning theimpeller in closer proximity to the fuel bed.

In the form of the invention shown in Figs. 3 and 4 an impeller of fanwheel type is shown attached to the shaft 16 to receive rotary motiontherefrom. In this type the impeller is formed by two spaced circularplates 3| and 32 having vanes 33 around the periphery and connecting themarginal rims of the two plates 3| and 32. The plate 32 is provided withan axial opening 34 so that gases are drawn inward and projectedradially outward by the vane structure to produce the desired gascirculation or turbulence. Preferably this type of impeller or agitatoris provided with a cylindrical bailie 35 of slightly larger diameterthan the impeller and mounted coaxially below the inlet plate 32, beingsuspended from Thus when sult, maximum heat absorption is maintained,

and the heating surfaces of the boiler may be materially reduced. Asubstanital amount of heat units, which heretofore have-been lost in theber in communication with said fire bed chamber for receiving combustiongases from said bed and transferring heat from said gases to a fluidmedium, said apparatus also having an opening for the escape of saidgases from the second mentioned wall portion, a device comprising rotaryblades extending substantially entirely out of alignment with saidopening for causing said gases to impinge repeatedly and at increasedvelocity against the inner surfaces of said second mentioned wallportion, and means forming a positive drive connected with said rotaryblades.

3. In combination, heatin apparatus having a wall portion-defining achamber for a fire bed, and also havinga wall portion rigid with thefirstmentioned wall portion and extending beyond the chimney or flue,now become available and useful. Also, for a given stack draft conditionthe rate of combustion is materially increased.

In both forms of impellers used the rotative speed is preferably'suchthat the impeller will handle several times the amount of gas given.

oil by the fuel bed, so that the gases arev forced to' circulate in aclosed path several times before passing to the chimney.

While in the foregoing the surfaces against which the gases impinge athigh velocity are illustrated as those in the combustion chamber, theinvention, in its broader aspects, is not limited theretosince manyheaters have not only these combustion-chamber heating surfaces but alsosupplemental heating surfaces in chambers through which the gases travelafter leaving the combustion chamber. Broadly, therefore, the inventionincludes apparatus for impelling the hot gases at high velocity againstheat absorbing surfaces whether in the combustion chamber or in chamberssupplemental thereto.

The terms and expressions which I have .employed are used as terms ofdescription and .not of limitation, and I have no intention, in the useof such terms and expressions, of excluding any equivalents of thefeatures shown and described or portions thereof, but recognize thatvarious modifications are possible within the scope of the inventionclaimed.

I claim:

.1. In combination, locatingv apparatus having'a wall portion defining achamber for a fire bed,-

and also having a wall portion rigid with the first-mentioned wallportion and extendin beyond the same to provide aheat-absorbing:chamberin communication with said fire bedchamber for receiving combustiongases from said bed and transferring .heat from said gases to a fluidmedium, said apparatus also having an opening for-the escape of saidgases from the second mentioned wall portion, a device comprising rotaryblades extending substantially entirely out of alignment with saidopening for causing said gases to recirculate along inner surfaces ofsaid second mentioned wall portion, and means forming a positive driveconnected with said rotary blades.

2. In combination, heating apparatus'having a wall portion defining. achamber for a fire bed,

and also having a wall portion rigid with the first-mentioned wallportion and extending beyond the same to provide aheat-absorbingcham---" same to provide .a heat-absorbing chamber incommunication with said fire bed chamber for receiving combustion gasesfrom said bed and transferring heat from. said gases to a fiuid medium,said-apparatus also having an opening for. the escape of said'gases fromthe second mentioned wall portion, an impeller comprising bladesextending substantially entirely out of alignment withsaidopening forcausing a flow of gases longitudinally within the second men-.

tioned wall portion toward said openin and along the innersurfaces'oflsaidzseoond mentioned wall portion, and positive-meansfor'rotatingsaid impeller.

4. In arhea-ting apparatus the combination. of a. heating unit.including a fire bed chamber, a heat absorbingchamber rigid withv saidfire bed chamber 'andin communication therewithfor receiving combustiongases from said firebed chamber.

and: surrounding heating surfaces, a. fiueoutlet, for products. ofcombustion, means to admit fuel.

into said. fire bed chamber, means comprising rotary bladesextendingsubstantiallyentirely-out' of line" with said outlet to causesaid products .of

combustion toimpinge more. than once .uponsaid heating surface, wherebyavailable heat units normally escapin to said flue outlet are utilizedin the heating of. said surfaces, and :means form! ing a positive driveconnected with said rotary blades.

RALPH ANTHONY KRAUSS.

REFERENCES CITED The following references are of record in the fileof'this patent:

UNITED STATES PATENTS Number Name Date 7 75,429 Kellogg Mar. 10, 1868373,030 Steel NOV. 8, 1.887. 742,339 Lyons Oct. .27, 1903. 1,123,526'Hanson Jan. 5, 1915 1,611,913 Inch Feb. 23, 1926.. 1,623,746 Murray Apr.5,1927 1,938,241 Banfield Dec. .5, .1933 2,197,495 Faulds Apr. 16,11940.1 2,224,544 Keller Dec. 10, 1940-1 .FOREIGNPATENTS Number CountryDate i 1,396 Great Britain Dec. '6, 1859 244,374 Germany Mar. 10, 1912;222,656 Great-Britain Sept. 19'. 1924'"

